I have just bought a Suzuki TL1000R (another story) from a guy who was selling in order to buy a nice '06 SD990. The one he's keen on has K&Ns fitted directly to the throttle bodies with no airbox at all. I've never heard of this being done because presumably you'd loose the velocity stacks and all the associated resonant frequency stuff. Anyone have an opinion on this?

Anyway, I said I'd ask on here if anyone had a Motohooligan or Rotweiller airbox for sale so at least he'd have the option to fit one if necessary.

A TL1000R - I almost bought a highly modified one of these that had been successfully campaigned in the hill climbing arena. Gixer front end and a LOT of other mods. There is a lot you can do apparently including replacing the odd rear suspension.